This is a complete version history for the J-Chat (J-チャット) client. Mac and Windows released usually happened in tandem.
Beta versions and incremental updates will likely be missing unless we get more detailed info to fill in the gaps.
PC and Mac
|Version Number||Build/Release Date||Windows||Mac||Confirmed Released||Installer Archived|
|V1.0L10||23rd August 1999||Y||Unknown||Y||Windows Only|
|V1.0L16F||26th January 2007||Y||Unknown||Y||Windows only|